Ontogenetic and Temporal Shifts in the Diet of the Amphipod Gammarus fasciatus, in the Ohio River

1997 ◽  
Vol 137 (2) ◽  
pp. 329 ◽  
Author(s):  
R. Brent Summers ◽  
M. D. Delong ◽  
J. H. Thorp
Keyword(s):  
Ohio River ◽  
Gammarus Fasciatus ◽  
Temporal Shifts

Influence of Food Type on the Growth of a Riverine Amphipod, Gammarus fasciatus

1993 ◽  
Vol 50 (9) ◽  
pp. 1891-1896 ◽  
Author(s):  
Michael D. Delong ◽  
R. Brent Summers ◽  
James H. Thorp
Keyword(s):  
Organic Matter ◽  
Particulate Organic Matter ◽  
Natural Populations ◽  
Food Sources ◽  
Food Type ◽  
Filamentous Algae ◽  
Ohio River ◽  
Natural Diet ◽  
Gammarus Fasciatus ◽  
Dead Animal

A laboratory experiment and natural-diet study were conducted to examine the feeding ecology and importance of food type for growth of Gammarus fasciatus from the Ohio River. To determine effects on growth, amphipods were fed four diets: (1) filamentous algae (Cladophora) and diatoms, (2) dead animal matter (chironomids), (3) coarse particulate organic matter (CPOM), and (4) fine particulate organic matter (FPOM). Organic matter was obtained by shredding preconditioned sycamore leaves (Platanus occidentalis). Growth was evaluated from weekly measurements of head length. There were no significant differences in growth among food types before week 3 of the experiment, but from week 4 to week 6, amphipods fed algae and dead animal matter were significantly larger than those maintained on CPOM and FPOM. Gut analysis of natural populations showed that G. fasciatus consumed all food types used in the laboratory study. The weighted proportions of filamentous algae and animal matter in riverine populations increased consistently from smallest to largest size-class. The availability of, and ability to use, algae and animal matter by G. fasciatus benefits natural populations in large rivers by enabling them to exploit seasonal changes in the relative abundance of different food sources.

The Government Works on the Ohio River

1886 ◽  
Vol 2 (2build) ◽  
pp. 32-33
Keyword(s):  
Ohio River ◽  
The Government

Freight Traffic on the Ohio River

1961 ◽  
Vol 17 (3) ◽  
pp. 51-57
Author(s):  
Charles E. Landon
Keyword(s):  
Ohio River ◽  
Freight Traffic
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